[ic] LoadGlobalIC caches PropertyCells in the feedback vector.

src/type-feedback-vector.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPE_FEEDBACK_VECTOR_H_
 #define V8_TYPE_FEEDBACK_VECTOR_H_
 
 #include <vector>
 
 #include "src/base/logging.h"
@@ skipping 446 matching lines @@
  public:
   LoadGlobalICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK_EQ(FeedbackVectorSlotKind::LOAD_GLOBAL_IC, vector->GetKind(slot));
   }
   LoadGlobalICNexus(TypeFeedbackVector* vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK_EQ(FeedbackVectorSlotKind::LOAD_GLOBAL_IC, vector->GetKind(slot));
   }
 
+  int ExtractMaps(MapHandleList* maps) const final {
+    // LoadGlobalICs don't record map feedback.
+    return 0;
+  }
+  MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const final {
+    return MaybeHandle<Code>();
+  }
+  bool FindHandlers(CodeHandleList* code_list, int length = -1) const final {
+    return length == 0;
+  }
+
   void ConfigureMegamorphic() override { UNREACHABLE(); }
   void Clear(Code* host);
 
+  // TODO(ishell): remove LoadIC-style mode support.
   void ConfigureMonomorphic(Handle<Map> receiver_map, Handle<Code> handler);
 
+  // PropertyCell shortcut mode.
+  void ConfigureUninitialized() override;
+  void ConfigurePropertyCellMode(Handle<PropertyCell> cell);
+  void ConfigureHandlerMode(Handle<Code> handler);
+
   InlineCacheState StateFromFeedback() const override;
 };
 
 class KeyedLoadICNexus : public FeedbackNexus {
  public:
   KeyedLoadICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
       : FeedbackNexus(vector, slot) {
     DCHECK_EQ(FeedbackVectorSlotKind::KEYED_LOAD_IC, vector->GetKind(slot));
   }
   KeyedLoadICNexus(TypeFeedbackVector* vector, FeedbackVectorSlot slot)
@@ skipping 74 matching lines @@
   KeyedAccessStoreMode GetKeyedAccessStoreMode() const;
   IcCheckType GetKeyType() const;
 
   InlineCacheState StateFromFeedback() const override;
   Name* FindFirstName() const override;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TRANSITIONS_H_